Tyuya Muyun Caves, Kyrgyzstan
Speleothems: thin (2 mm) layer (on alterated tangeite)
Frequency: Extremely Rare
First description of cave occurrence: Smolianinova, N.N. 1970. Some data on mineralogy and geochemistry of the Tyuya-Muyun ore deposit. in Geology and geochemistry of ore deposits, Nauka, Moscow: 56-90 (in Russian)
First description of non-cave occurrence: Dufrenoy, A. 1842. Description de l'arsénio-sidérite, nouvelle espèce d'arséniate de fer. Annales des Mines 2: 343-348
limestone (the massif is surrounded by Silurian black schists and sandstones, and it is impregnated by ore vein)
Group: Arsenates
Chemical formula: Ca2Fe3+3O2(AsO4)3·3H2O
[According to the official IMA-CNMNC List of Mineral Names (http://nrmima.nrm.se/imalist.htm)]
Deposition and stability: It formed as the weathering product of tangeite
Color: shining yellow
On tangeite
- Monoclinic